ROT13 / Caesar Cipher
ROT13 (shift 13) is self-inverse: apply again to decrypt. Only letters are shifted, no real security.
ROT13 and Caesar cipher
The Caesar cipher shifts each letter by a fixed number of positions in the alphabet. ROT13 is the special case with shift 13 – popular for hiding spoilers or solutions.
- ROT13: Applying it twice restores the original text (13 + 13 = 26).
- Caesar: Choose any shift from 0 to 25. To decrypt, use a shift of 26 − n.
- Not a security tool: The cipher is trivial to crack and only serves to obscure.